Re: filter() + refresh() clears the screen below cursor

[Thomas Dickey]

On Thu, 15 Mar 2007, Christer Enfors wrote:

> I have a script that puts the cursor on a specific row on the screen.
>
> Then I have my program (called instring), which displays a form with a single 
> input field on a specified column on that row. I'm using filter() (and 
> newterm() connected to /dev/tty) in my program, to avoid clearing the screen 
> when the program starts.
>
> Now, my problem is, that as soon as I call refresh(), the entire screen 
> *below* (and including, I think) the current line is cleared. I don't want it 
> to do that. Is there some way I can get around that?

That sounds like a bug (calling filter assumes there's only one line to 
update).  Actually filter is implemented by disabling some things during 
initialization, and doesn't iirc affect the screen optimization, so the 
clearing operations might be using the escape sequence that clears to the 
end of the screen, e.g., \E[J.  If that's so, you could work around that 
by defining/using a terminal description that lacks the "ed" capability 
and makes it rely on "el" and "el1".

> Would it work to open a 1-line window for my form, and only wrefresh() that 
> window (and never call refresh())? Would that prevent the rest of the screen 
> from being cleared?
>
> Sorry about all these questions, but this program is part of a release that's 
> scheduled for Tuesday, and I don't have time to spend on being stuck.
>
> --
> Christer Enfors
>
>
>
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--
Thomas E. Dickey
http://invisible-island.net
ftp://invisible-island.net